| ABSTRACT:With the accelerating process of urbanization, The limited land resources of the city can not meet the ever-growing needs of people,which makes urban construction strive for space from high altitude and underground. Many big and deep foundation pit projects emerge as the times require.It constitutes a common problem that the construction of these projects has negative influences on nearby existing subway. In this case, it is necessary not only to ensure the stable of the foundation pit itself, but also to ensure both the safety and normally of the existing subway which is adjacent to the foundation pit. Therefore, it’s significant to estimate the influence law of the foundation pit excavation impacting on the existing subway and the track accurately,to summary the successful experience of project and to ensure the safe and smooth of the project.In this paper, taking the two adjacent foundation pits of Southern District of Beijing Olympic project that are big and deep adjacent to the anzhenmen station for the study to analyse the influence of the existing subway and the track.The main work of this paper:(1)According to the4#,5#deep and big foundation pits of Southern District of Beijing Olympic project adjacent to anzhenmen station and tunnel,using three-dimensional finite element software ANSYS to establish the three-dimensional model,simulating the influence of the subway by the foundation pits excavated, analyzing the deformation of the main structure, subsidiary structure,tunnel and the track,what’s more,contrasting the measured and simulated values,summaring the law and analyzing possible problems existed.(2) Analyzing the Deformation trend of the existing subway station and the track on the different construction order and different retaining structure of the two foundation pits and summaring the impact characteristics of different construction programs for subway station which can provide a reference for similar projects. |
PDF Full Text Request